Feeding mechanism.



PATBNTED MAY 19, 1908.

G. WAGNER. PEEDING MECHANISM.

APPLIGATIDI FILED 00T. 4. 1908.

PATBNTED MAY 19, 1908.

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GUSTAV WAGNER, F RELTLIXGEN, GERMANY.

FEEDING MECHANISM.

Specification of Letters Patent.

Patented May 19, 1908.

Application filed October 4. 1906. Serial No. 337.410.

To all w/zom 'it may concern.'

Be it known that I, Grs'rAv WAGNER, manufacturer, a citizen of the Kingdom of iiirtembergy residing at Reutlingen, in the Kingdom of Wrtemberg, Germany, have invented new and useful Improvements in| nut 1n one direction or other around the feed Feeding Mechanisms; and I do hereby del clare the following to be a full, clear, and exactdescription of the same.

In circular saw machines and some other apparatus of a like kind the feeding mechanism is arranged to cause a slow rotation of a feed screw which traverses the slide or table.

The screw works through a nut which is normally held stationary but is allowed to move, when the pressure becomes abnormal, by either compressing a spring or raising a weighted lever. Hitherto these arrangements have been such that the feed screw continues to rotate in the nut during the compression of the spring or the raising of the weight so that when the pressure tends to ex- Ceed the normal limit a reduction of the feeding speed is produced by the actual moving of the nut against the resistance of the weight or spring; by the present arrangement, however,when the feeding pressure tends to exceed the normal the rate of feed is automatically reduced for a time by the release of the nut, and the feed is caused to take place at approximately constant pressure under the ac- Y tion of the weight or the like until the feeding pressure again falls so as to allow the normal feeding speed to be resumed. Thus it will be seen that by the present arrangement the feed can never take place at a pressure greater than the limit due to the action of the weight or the like, but in other arrangements hitherto employed the feed might often take place at great pressure with disadvantageons results. In machines of this kind also it is often desirable to arrange for the quick movement of the slide in either' direction of motion for adjusting the apparatus ready for working or before making a fresh cut for example. According to this invention a device is provided whereby such quick adjustment of the slide can be effected without the necessity of throwing out of gear the mechanism by which the feed screw is actuated.

The invention is illustrated in the accompanying drawings wherein it is shown as applied to a circular saw machine.

Figure 1 shows the machine in front view Fig. 2 is a plan view and Fig. 3 an end elevation of the machine. Fig. 4 shows the driving apparatus for the feed mechanism. Fig. 5 is an enlarged view showing the feedscrew nut in thelposition for normal feeding. Fig. 6 `shows the feed screw nut in the position wherein the feed is stopped or in which the slide can be adjusted by the rotation of the screw. Fig. 7 is a detail view showing the open and crosse(I belts and belt` pulleys.

The machine illustrated is a circular sawof a well known pattern designed principally for cold sawingv of metal and in which the saw bench is stationary while a slide is provided carryingthe circular saw and adapted to be traversed longitudinally with the actuating mechanism. y

In the drawings the bed of the machine has fixed thereto7 a standard which is formed as a guide for the slide T. rl`he slide carries the main driving shaft which is actuated by a belt working on the usual fast and loose pulleys, said shaft in turn being arranged to rotate the saw` blade 29 by means of a worm and wornrwheel (shown in Figs. 2 and 3).

The normal feed of the slide is effected by a feed screw l which is driven from the main shaft as described below, and works in a nut- 12 (Figs. 5 and 6), this latter in turn being normally held stationary by friction against the face of abracket lfixed upon the standard. In the norma-l traversing motion, the screw 1 thus feeds itself through the stationary nut and-mo ves longitudinally, carrying the slide 7 with it.

The feed screw is normally driven by the following mechanism z-Steppe 'l pulleys 2 and 3 are. provided on the sleeve 4 and on the end of the main shaft respectively, while the. sleeve 4 isfree (see Fig. 4) to rotate around the end ofthe screw spindle l and drives said spindle through a back gear com rising the toothed wheels 5 and 6, l() an 11. The shaft 9 which carries the wheels 6 and 10 is long enough (see Fig. 4) to permit of the longitudinal movement of the wheel 1() thereon for the purpose lof disengaging it from the wheel 1 1 when it is required to throw this gear out of action; the wheel 11 is keyed to the shaft 1. S is a'bracket extending upward from the slide 'Z and embracing the shaft 1 between thepulley 11 and the sleeve 4. T he screw 1 traverses the slide 7 through the connecting piece or bracket 8. The screw 1 engages in anut 12 (Figs. 5 and 6) upon an extension of which is arranged a sleeve 13 prevented from longitudinal motion by a locking ring 12. The nut 12 has a pulley 18 fixed thereto and formed with a boss 16 which is adapte-d to engage frictionally against the fact' of t-lie bracket 17. rThe nut is normally held in the engaging position by a weighted lever 1.5 having a toothed boss which engages in rack teeth 14 on the sleeve 13. The normal direction of feed is such that the screw 1 tends to pull the nut with the boss 16 away from the face of the bracket 17, but so long as the feeding pressure is not too great this tendency is overcome by the action of the u eighted levei l5 which holds the boss 16 against the face of the bracket. So long as the parts are in this latter position the table is fed normally but when the pressure becomes excessive the lever 15 is raised (by hand or otherwise) allowing the nut to move out from the bracket, thus separating the boss 16 and the face of the bracket and allowing the nut to turn with the screw whereby the screw feed is stopped for the time being. The slide may, however, continue to be fed forward because the weighted lever will tend to fall and to bring the nut again into fric.- tional engagement with the bracket 17, and

when the point of high resistance has been passed the nut will again take up the feed and canse the slide to niove at its normal speed of feed.

- For effecting the qu'ick adjustment of the slide to any desired position a sl-iaft 25 is provided driven from the. shaft c by a belt passing over pulleys 2G and 27. The shaft 25 carries two loosely mounted belt pulleys 22 and 24 which are connected by crossed and open belts 21 and 22 respectively with belt surfaces 19 and 20 on the pulley 18. Between the pulleys 23 and 24 is arranged a clutch 3U adapted to be moved by a hand lever 31 in order to engage either of the pulleys with the shaft 25. The lever 31 may be provided with any convenient mechanism which will serve to lift the weighted lever 15 and hold it in a definite position during the adjustment of the slide or said lever may be moved by hand to a position in which the pulley 1S with its boss 16 is at a little distance from the bracket 17. The shaft 25 may be also arranged to actuate a pump for supplying water through the pipe 28 for cooling the work and the saw blade in well known manner.

It will be seen that the back gear 5, G, 10 and 11 is such as to reduce the speed of rotation of the screw shaft 1 relatively to the main shaft and as a rule said screw shaft will make about five or ten revolutions per minute as compared with the speed of rotation of the main shaft of about 200 It. P. M. The shaft 25, is, however, at a much greater speed than the screw shaft 1 so thatwhen the pulley 18 is rotated in one direction or other by the open or crossed belts 21 and 22 from the pulleys 23, 24 on the shaft 25 the nut 12 will be. rotated at a considerably greater speed than the screw 1 either in the same direction of rotation as said screw or in the opposite direction thereto. Consequently by throwing into action the belt drive through either of the belts 2l or 22 the nut 12 can be table can be quickly set to any required posi# tion without stopping the feeding screw. l

The adjustment of the table can be effected by hand if required by turning the handle 32 when the power drive is not in action, this handle 3'. being keyed upon the screw shaft 1. The handle may also be used for giving a hand-feed if required during the normal working of the machine.

what I claim is:

1. A feed mechanism for circular saw machines and other machines, comprising a main shaft. a feed screw and a connection for transmitting motion from the main shaft to the feed screw and including a stepped pulley loosely mounted on said feed screw, in combination with a feed nut engaged by said screw, a belt pulley connected with said feed nut and having two pulley surfaces, an open belt engaging one of said pulley surfaces, a crossed belt engaging the other pulley surface. and a driving shaft provided with pulle`s engaged by the belts aforesaid.

2. A feed mechanism for circular saw machines and other machines, comprising a feed screw and means for operating the same, in combination with a bracket of the inachine, a sleeve fitting in said bracket, and a feed nut rotatably and non-slidahly mounted in `said sleeve and itself engaged by said feed screw, a boss on said feed nut, and a weight or the like for normally holding the boss aforesaid into engagement with the bracket.

3. A feed mechanism for circular saw machines and other machines, comprising a feed screw and means for operating the same, in combination with a bracket of the machine, a sleeve slidably fitting in said bracket, and a feed nut rotatably and non-slidably mounted in said sleeve and itself engaged by said feed screw, a belt pulley connected with said feed nut, a rack formed upon the sleeve aforesaid and a weighted gear engaging said rack and normally holding the pulley aforesaid iiito frictional engagement with the bracket.

In testimony whereof I have signed my naine to this Aspecification in the presence of two subscribing witnesses.

GUSTAV IVAGNER.

l'itnesses:

ABRAHAM SCHLESINGER, Louis MUELLER. 

